Light-independant reactions

The Calvin Cycle; carbon dioxide fixation involves a five-carbon coumpound called ribulose bisphosphate (RuBP) and an enzyme called ribulose bisphosphate caboxylase (ribisco). With the catalytic help of rubisco, RuBP combines with CO2 to form an unstable six-carbon compound which splits immediately into two molecules of a three-carbon compound, glycerate bisphosphate (GP). GP is then reduced to a triose phosphate called glyceraldehyde 3-phosphate (GALP). This reaction requires hydrogen and energy from ATP; both are supplied by the light-dependant reactions. About one-sixth of the total GALP is then used to make glucose. This can be converted into other carbohydrates. The remaining five-sixths is converted back to RuBP. The regeneration of RuBP requires phosphate from ATP
Calvin cycle
1. Rubisco catalyses fixation CO2
  1. 6-C intermediate
    1. 2 x glycerate 3-phosphate (GP)
      1. GALP
        1/6 GALP
        Glucose
        amino acids
        Lipids
        Sucrose
        RuBP
        3 CO2
  2. 3 CO2

Resource summary

	Created by harry_bygraves over 11 years ago